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An efficient hydrogen production can be achieved by irradiating suspensions of ZnS in various electrolyte solutions (Sz-, SO:-, S20:-, H2P0,). The deposition of a metal such as platinum on the surface of ZnS microcrystals does not significantly improve the charge transfer reaction. In solutions containing SO?-ions, hydrogen generation occurs concomitantly with the oxidation of S032-ions to sulfate and dithionate. The rate of this reaction strongly depends on the quality of the ZnS sample. With the most active ZnS photocatalyst, a quantum yield of 0.90 has been obtained. Sixteen liters of hydrogen were produced with 1.0 g of ZnS in 35 h without any observable deactivation of the photocatalyst. The rate of hydrogen formation in solutions containing S2-ions is decreased due to the formation of disulfide ions which compete with the proton reduction. Addition of hypophosphite or sulfite ions, which efficiently suppress the disulfide formation, allows hydrogen to evolve at a higher rate. In mixtures of S2-and hypophosphite ions, phosphite and phosphate ions are the oxidation products. In solutions containing both S2-and ions, formation of thiosulfate ions occurs concomitantly with hydrog

Author

Jean Francois Reber; Kurt Meier

Published

1984

Language

EN